Rainer Ng (200m Backstroke), Cheryl Lim (200m Breaststroke), Chriselle Koh (400m Freestyle) and the mixed 4x100m Medley relay team failed to qualify for the final in their respective events.
Swimmer Amanda Lim qualified for her first individual final in the Youth Olympic Games when she finished third in her race, and sixth overall in the semi-finals of the 50 metres Freestyle, her pet event.
He clocked a time of 26.45 seconds, just 0.09 behind the eventual champion Christian Homer of Trinidad and Tobago.
He clocked 2 minutes 32.27 seconds, half a second faster than his result at May's YOG Asian Area Qualification. Zachary finished 16th overall and to secure himself a place in the B Final.
Adeline's time of 31.43 seconds in the women's 50 metre Backstroke was 15th fastest in the field. It also improved on her season's best of 31.50. Sheng Jun advanced from his men's 50m Butterfly heat with his 25.63s performance, placing him 10th overall. It was a new personal best of him and made him the second fastest Singaporean for this event this year, just behind Dzuhaili Mohd Kamal's 25.57.
18 year old Rainer Ng set a new national record in the men's 50 meter Backstroke when he won his semi-final with a time of 26.37 seconds.
Amanda Lim was the sole Singapore swimmer who secured a spot in the evening semi-finals when she placed 12th in the women's 100 metres Freestyle heats in the Youth Olympic Games swimming competition.
Singapore's Cheryl Lim and Rainer Ng qualified for the semi-finals of the girls' 50 metre Breaststroke and boys' 100m Backstroke respectively on day one of the Youth Olympic Games swimming competition.